Plague Inc. Wiki
Plague Inc. Wiki

Plague Dogs is an achievement exclusive to the Shadow Plague DLC. It causes pustule-covered dogs to infect people who pet them due to the pustules bursting.

How to get this achievement?

Evolve the symptom Dark Pustles and the transmission Dog 2.

** When I did this, I had to evolve Weeping Sores in order to get the achievement.